drivers/mcb/mcb-parse.c

   1 #include <linux/types.h>
   2 #include <linux/ioport.h>
   3 #include <linux/slab.h>
   4 #include <linux/export.h>
   5 #include <linux/io.h>
   6 #include <linux/mcb.h>
   7
   8 #include "mcb-internal.h"
   9
  10 struct mcb_parse_priv {
  11         phys_addr_t mapbase;
  12         void __iomem *base;
  13 };
  14
  15 #define for_each_chameleon_cell(dtype, p)       \
  16         for ((dtype) = get_next_dtype((p));     \
  17              (dtype) != CHAMELEON_DTYPE_END;    \
  18              (dtype) = get_next_dtype((p)))
  19
  20 static inline uint32_t get_next_dtype(void __iomem *p)
  21 {
  22         uint32_t dtype;
  23
  24         dtype = readl(p);
  25         return dtype >> 28;
  26 }
  27
  28 static int chameleon_parse_bdd(struct mcb_bus *bus,
  29                         struct chameleon_bar *cb,
  30                         void __iomem *base)
  31 {
  32         return 0;
  33 }
  34
  35 static int chameleon_parse_gdd(struct mcb_bus *bus,
  36                         struct chameleon_bar *cb,
  37                         void __iomem *base, int bar_count)
  38 {
  39         struct chameleon_gdd __iomem *gdd =
  40                 (struct chameleon_gdd __iomem *) base;
  41         struct mcb_device *mdev;
  42         u32 dev_mapbase;
  43         u32 offset;
  44         u32 size;
  45         int ret;
  46         __le32 reg1;
  47         __le32 reg2;
  48
  49         mdev = mcb_alloc_dev(bus);
  50         if (!mdev)
  51                 return -ENOMEM;
  52
  53         reg1 = readl(&gdd->reg1);
  54         reg2 = readl(&gdd->reg2);
  55         offset = readl(&gdd->offset);
  56         size = readl(&gdd->size);
  57
  58         mdev->id = GDD_DEV(reg1);
  59         mdev->rev = GDD_REV(reg1);
  60         mdev->var = GDD_VAR(reg1);
  61         mdev->bar = GDD_BAR(reg2);
  62         mdev->group = GDD_GRP(reg2);
  63         mdev->inst = GDD_INS(reg2);
  64
  65         /*
  66          * If the BAR is missing, dev_mapbase is zero, or if the
  67          * device is IO mapped we just print a warning and go on with the
  68          * next device, instead of completely stop the gdd parser
  69          */
  70         if (mdev->bar > bar_count - 1) {
  71                 pr_info("No BAR for 16z%03d\n", mdev->id);
  72                 ret = 0;
  73                 goto err;
  74         }
  75
  76         dev_mapbase = cb[mdev->bar].addr;
  77         if (!dev_mapbase) {
  78                 pr_info("BAR not assigned for 16z%03d\n", mdev->id);
  79                 ret = 0;
  80                 goto err;
  81         }
  82
  83         if (dev_mapbase & 0x01) {
  84                 pr_info("IO mapped Device (16z%03d) not yet supported\n",
  85                         mdev->id);
  86                 ret = 0;
  87                 goto err;
  88         }
  89
  90         pr_debug("Found a 16z%03d\n", mdev->id);
  91
  92         mdev->irq.start = GDD_IRQ(reg1);
  93         mdev->irq.end = GDD_IRQ(reg1);
  94         mdev->irq.flags = IORESOURCE_IRQ;
  95
  96         mdev->mem.start = dev_mapbase + offset;
  97
  98         mdev->mem.end = mdev->mem.start + size - 1;
  99         mdev->mem.flags = IORESOURCE_MEM;
 100
 101         mdev->is_added = false;
 102
 103         ret = mcb_device_register(bus, mdev);
 104         if (ret < 0)
 105                 goto err;
 106
 107         return 0;
 108
 109 err:
 110         mcb_free_dev(mdev);
 111
 112         return ret;
 113 }
 114
 115 static void chameleon_parse_bar(void __iomem *base,
 116                                 struct chameleon_bar *cb, int bar_count)
 117 {
 118         char __iomem *p = base;
 119         int i;
 120
 121         /* skip reg1 */
 122         p += sizeof(__le32);
 123
 124         for (i = 0; i < bar_count; i++) {
 125                 cb[i].addr = readl(p);
 126                 cb[i].size = readl(p + 4);
 127
 128                 p += sizeof(struct chameleon_bar);
 129         }
 130 }
 131
 132 static int chameleon_get_bar(char __iomem **base, phys_addr_t mapbase,
 133                              struct chameleon_bar **cb)
 134 {
 135         struct chameleon_bar *c;
 136         int bar_count;
 137         __le32 reg;
 138         u32 dtype;
 139
 140         /*
 141          * For those devices which are not connected
 142          * to the PCI Bus (e.g. LPC) there is a bar
 143          * descriptor located directly after the
 144          * chameleon header. This header is comparable
 145          * to a PCI header.
 146          */
 147         dtype = get_next_dtype(*base);
 148         if (dtype == CHAMELEON_DTYPE_BAR) {
 149                 reg = readl(*base);
 150
 151                 bar_count = BAR_CNT(reg);
 152                 if (bar_count <= 0 && bar_count > CHAMELEON_BAR_MAX)
 153                         return -ENODEV;
 154
 155                 c = kcalloc(bar_count, sizeof(struct chameleon_bar),
 156                             GFP_KERNEL);
 157                 if (!c)
 158                         return -ENOMEM;
 159
 160                 chameleon_parse_bar(*base, c, bar_count);
 161                 *base += BAR_DESC_SIZE(bar_count);
 162         } else {
 163                 c = kzalloc(sizeof(struct chameleon_bar), GFP_KERNEL);
 164                 if (!c)
 165                         return -ENOMEM;
 166
 167                 bar_count = 1;
 168                 c->addr = mapbase;
 169         }
 170
 171         *cb = c;
 172
 173         return bar_count;
 174 }
 175
 176 int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
 177                         void __iomem *base)
 178 {
 179         struct chameleon_fpga_header *header;
 180         struct chameleon_bar *cb;
 181         char __iomem *p = base;
 182         int num_cells = 0;
 183         uint32_t dtype;
 184         int bar_count;
 185         int ret = 0;
 186         u32 hsize;
 187
 188         hsize = sizeof(struct chameleon_fpga_header);
 189
 190         header = kzalloc(hsize, GFP_KERNEL);
 191         if (!header)
 192                 return -ENOMEM;
 193
 194         /* Extract header information */
 195         memcpy_fromio(header, p, hsize);
 196         /* We only support chameleon v2 at the moment */
 197         header->magic = le16_to_cpu(header->magic);
 198         if (header->magic != CHAMELEONV2_MAGIC) {
 199                 pr_err("Unsupported chameleon version 0x%x\n",
 200                                 header->magic);
 201                 ret = -ENODEV;
 202                 goto free_header;
 203         }
 204         p += hsize;
 205
 206         bus->revision = header->revision;
 207         bus->model = header->model;
 208         bus->minor = header->minor;
 209         snprintf(bus->name, CHAMELEON_FILENAME_LEN + 1, "%s",
 210                  header->filename);
 211
 212         bar_count = chameleon_get_bar(&p, mapbase, &cb);
 213         if (bar_count < 0)
 214                 goto free_header;
 215
 216         for_each_chameleon_cell(dtype, p) {
 217                 switch (dtype) {
 218                 case CHAMELEON_DTYPE_GENERAL:
 219                         ret = chameleon_parse_gdd(bus, cb, p, bar_count);
 220                         if (ret < 0)
 221                                 goto free_bar;
 222                         p += sizeof(struct chameleon_gdd);
 223                         break;
 224                 case CHAMELEON_DTYPE_BRIDGE:
 225                         chameleon_parse_bdd(bus, cb, p);
 226                         p += sizeof(struct chameleon_bdd);
 227                         break;
 228                 case CHAMELEON_DTYPE_END:
 229                         break;
 230                 default:
 231                         pr_err("Invalid chameleon descriptor type 0x%x\n",
 232                                 dtype);
 233                         ret = -EINVAL;
 234                         goto free_bar;
 235                 }
 236                 num_cells++;
 237         }
 238
 239         if (num_cells == 0)
 240                 num_cells = -EINVAL;
 241
 242         kfree(cb);
 243         kfree(header);
 244         return num_cells;
 245
 246 free_bar:
 247         kfree(cb);
 248 free_header:
 249         kfree(header);
 250
 251         return ret;
 252 }
 253 EXPORT_SYMBOL_GPL(chameleon_parse_cells);